INCLUDES - 1 pc hammock chair swing spring, 1 pc pin plug hardware, and 1 pc bearing. The spring and U-pin plugs are made of steel with a baked surface paint finish for rust-proof and corrosion-resistant performance. Upgrade kit bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps increase lubrication, reduce noise, absorb vibration during use, provide a buffering effect, extend the chair's service life, and enhance comfort. WIDE APPLICATION - Compatible with most hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. SAFER SUSPENSION - With a load capacity exceeding 500 pounds, the spring meets the daily usage needs of most households and aligns with the standard weight capacity of typical egg-shaped hanging chairs. EASY TO USE - Installation follows the included visual guide. The clevis pin passes through the support and connects to the spring. Simple to install or replace in minutes. QUALITY GUARANTEE - Each product is carefully inspected before packaging. Satisfaction guaranteed. If you are not completely satisfied for any reason, you may request a replacement or full refund.